Feat/fix: Fixed bash, cmd, powershell, etc routing

[burgercrisis]

What does this PR do?

Fixes very many issues for windows users with how it uses shells. no cross-shell translation logic; just clean cross-platform compatible shell routing

How did you verify your code works?

Used test scripts in building to verify probably 200+ commands Verified in app along the way with a suite of commands % pass on my in-app test suite of 140 commands pre-fix: ~40% % pass on my in-app test suite of 140 commands post-fix: ~100%

Merged latest stable release 1.1.23 in. Cleaned repo. Cleaned related dead code - get_user_shell is now redundant with my upgrades.